As all can be test ridden, ride them all for as much as the dealers will let you. Then go with the one that you're most comfortable with. Long hours in the saddle mean the bike better fit you really well if you're going to get the most fun out of your tour. Fit is First. The components should be a secondary consideration, and with mileage and experience, will all likely be replaced anyway.
Last edited by Cyclebum; 10-21-10 at 09:06 AM.